The Only Pen You'll Ever Need: A Buyer's Guide to Multipens for Adults

Why Multipens Are Back

If you spent your high school years lingering at stationery counters, you probably went one of two ways: either you stopped using pens entirely but still buy novelty ones, or you’ve stockpiled a small mountain of old favorites. I’m in both camps. That’s how I noticed the gap between “student pens” and “adult pens.” The multipen—once the most useless thing in my pencil case—is now the only pen I carry.

Multipens, also called multifunction pens, pack multiple refills into one barrel. They’re not new. If you were born before 2000, you probably had one of those chunky multi-color ballpoint pens with eight or ten colors crammed inside. Students would use them for doodling, but for serious writing, they were a pain.

Why Students Hate Them, Why Adults Love Them

For students, multipens are a bad deal. The refills are thin and don’t last long. And in most schools, ballpoint ink isn’t allowed because it doesn’t work with machine-graded exams. If you rely on gel refills, you’d burn through a pack a day and spend a fortune. But once you’re working, your writing volume drops. You need a pen that can switch colors or functions quickly, and you don’t care if the ink runs out after a week. That’s where multipens shine.

What to Look For

The first rule: think about refill compatibility before anything else. Can you find cheap third-party refills in the colors you need? Does the pen support the functions you want—like a mechanical pencil or highlighter? Then consider ink quality and price. Here’s a rundown by brand.

Budget Basics: Chinese Brands

If you just want a cheap multi-color pen, Chinese brands are the way to go. Search “multipen” on any shopping site and you’ll see dozens from M&G, Deli, Kaco, and others. Even Miniso and KKV sell rebranded versions made by these factories. They’re cheap and get the job done, but the barrels can be hit or miss—some have threads that loosen easily. If you can, try them in a physical store before buying.

LAMY: Design Over Function

LAMY, now owned by Mitsubishi Pencil (uni), is design-forward. Their st, logo, cp1, and 2000 series all have multipen versions, with two, three, or four colors. They use the standard D1 refill (more on that later), and some models have a gravity-feed mechanism—you rotate the pen so the color you want is on top, then press the single button. It’s elegant but slow, so not great for heavy note-takers. Fine for occasional color coding.

Pilot: The Coleto System

Pilot’s Coleto is the most customizable multipen out there. The refills come with their own color-coded buttons, so you click them into place. You can build a pen with 2 to 5 modules. The refill selection is insane: three gel tip sizes (0.3, 0.4, 0.5 mm), mechanical pencil modules, even a tiny eraser. Colors? Over 30, including fluorescent, metallic, and pastel. If you’re a collector, beware—they do limited editions with different button shapes.

Pilot also makes multipens in their Juice Up, Acroball, and FriXion lines, but they’re more basic.

Pentel: Quietly Great Ink

Pentel doesn’t show off, but their ink is top-notch. Their hybrid ballpoint (mid-ink) pens are smooth and fast-drying. The Vicuña and Calme lines have multipen versions, and Calme is designed to be quiet—nice for meetings. The i+ series is modular, with gel, mechanical pencil, and hybrid refills. You can even swap in the Sliccies color refills, which come in 15 shades. A fun quirk: the i+ barrel has a hole at the top for a headphone jack plug—a relic from the smartphone era, but you can still find them if you look.

Pentel also makes the Multi 8, a rare eight-color pencil for drafting. It uses 2.0 mm lead, so it’s a niche product for artists or engineers.

uni: The Standard Setter

Mitsubishi Pencil (uni) has a multipen for every series. The two big ones are Style Fit (gel) and Jetstream (hybrid). Style Fit is like Coleto—you pick the barrel and refills. There are 3-, 4-, and 5-slot barrels, and refills come in 0.28, 0.38, and 0.5 mm, with 16 colors. Jetstream is the gold standard for hybrid ink: not too slippery, not too dry, just right. Hobonichi planners give away a Jetstream multipen every year as a freebie.

uni also makes luxury versions like the ZENTO (magnetic closure) and the One 3 (short and stubby).

Refill Standards: What Actually Fits

Refills are where multipens get tricky. Most fall into two camps. The ISO D1 standard is 2.3 mm thick and 6.7 cm long, often with a metal tube. European brands like LAMY use this. The Japanese standard is 3 mm thick, and lengths vary—usually 8.8 or 9.8 cm. Pilot Coleto refills are 9.3 cm, while Pentel Sliccies and uni Style Fit are 9.8 cm. Jetstream is 8.8 cm, which is also the most common size for cheap Chinese refills—so you can find bargain replacements easily.

One warning: Pilot FriXion refills are thicker, and Zebra has three different standards (NJK, JK, and D1), which is why I didn’t recommend them. Always check the diameter and length before buying third-party refills.

Which One Should You Buy?

If you want maximum color choice, go with Pilot Coleto. If you want the best writing feel and cheap refills, pick uni Jetstream. If you’re on a budget, any Chinese multipen will do. The key is to match the pen to your actual needs—not the hype.

Happy writing.